package com.read.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class LoginFilter
 */
//@WebFilter(filterName="loginFilter",urlPatterns={"/*"})
public class LoginFilter implements Filter {

   

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		HttpServletRequest httpRequset = (HttpServletRequest)request;
		HttpServletResponse httpReponse = (HttpServletResponse)response;
		String url = httpRequset.getRequestURI();
		if(url.endsWith("login.jsp") || url.endsWith("login.do") || url.endsWith("unlogin.do")){
			chain.doFilter(request, response);
			return;
		}
		HttpSession session = httpRequset.getSession();
		String sessionKey = (String)session.getAttribute("sessionKey");
		if(sessionKey != null && !sessionKey.equals("")){
			chain.doFilter(request, response);
			return ;
		}else{
			httpReponse.sendRedirect(httpRequset.getContextPath()+"/login/login.jsp");
			chain.doFilter(request, response);
			return ;
		}
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
